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Dear Dr. Roach: I read your recent column regarding asymptomatic atrial fibrillation.

Dear Dr. Roach: Three years ago, I turned 60 and received my first dose of Shingrix. I had a highly unpleasant reaction, with fever and flulike symptoms.

Dear Dr. Roach: I have COPD, and my doctor explains that the trouble is that my lungs do not expel the full amount of the breath I take in. This prevents the full oxygen intake from my breath.

Dear Dr. Roach: How is preventive medical care handled when an individual is traveling to a remote location? For example, I will be hiking this summer in a remote area with no medical care available (it would take three days to get to a doctor).

Dear Dr. Roach: I am a 77-year-old woman. I have had problems with insomnia for at least 50 years, but it is much worse now. Some nights I don鈥檛 sleep, and some nights I get maybe three or four hours.

Dear Dr. Roach: I am interested in your perspective on intermittent fasting. I am in a walking group of seniors (all 65+ years). Six of us have been on this diet for six to eight weeks, and everyone has consistently lost a pound a week.

Dear Dr. Roach: Please help me understand the connection between the use of baby powder or talcum powder and ovarian cancer. I can鈥檛 grasp how a product that is applied externally can migrate to the ovaries and cause cancer. K.M.

Dear Dr. Roach: Can you tell me about food poisoning? I often hear the term, but it seems to mean different things to different people. V.A. Foodborne illnesses are indeed a very large and diverse group.

Dear Dr. Roach: I am a healthy man in my late 40s. I was married for 18 years to my first sexual partner. Since my divorce three years ago, I have had two additional partners. These were casual flings. I used condoms and did not catch anything.

Dear Dr. Roach : A friend is not getting vaccinated for COVID-19 because she thinks the vaccines could cause permanent fertility issues. Would you please comment on this? M.S. I can understand why a woman would be concerned about losing fertility.